Electric-arc lamp



(No Model.)

H. W. LIBBEY.

ELECTRIC ARC LAMP. No. 460,587. Patented 0011.6,1891.

h H z UNITED STATES PATENT OFFICE.

HOSEA IV. LIBBEY, OF BOSTON, llIASSACHUSE'ITlS.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 460,587, dated October6, 1891.

Application filed January 12, 1891- Serial No. 377,527. (No model.)

To all whom it may concern:

Be it known that I, HOSEA \V. LIBBEY, a citizen of the United States,residing at Boston,in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in Are Lamps, of whichthe following, taken in connection with the accompanying drawings, is aspecification.

My invention relates to that class of arc lamps in which a disk carbonis employed for the positive electrode anda pencil carbon for thenegative electrode; and theinvention consists in the peculiar manner ofoperating the electrodes and in the mechanism therefor.

Referring to the accompanying drawings, Figure 1 represents an arc lampembodying my lnvention. Fig. 2 is a side View of the same. Fig. 3 is adetached view of the diskoarbon holder.

I A represents a plate that may be supported in any suitable manner, andprovided with a boss a in the center of the lamp, this boss at having acircular opening through it.

B is a disk carbon having a square hole in its center. This carbon ismounted upon a holder 0, having a square boss 0 (see Fig. 3) to fit intothe hole in the carbon, and a flange 0', against which one side of thecarbon rests, and it is held in place by a pin D, passed through a holeat in the holder. Each end of the holder is tapered, and the ends fitinto correspondingly-formed recesses in the saddle E, that is formed'inone with a rod E, having a screw-thread E The upper end E of this rod isformed square, as shown. The rod E passes through the hole in the plateA, and 1s supported by a pin F of insulating material, that is mountedin a bearing f.

G is a bevel-wheel, which rests upon the boss a, and through which therod E also passes. The upper square end E of the rod passes through asquare hole in the standard H, secured to the pl ate A. A small spiralspring 9 is placed around the pin F, between the bearing f and the hubof the wheel G.

I is a bevel-wheel in gear with the wheel G. This wheell is mounted onthe end of a shaft J, carried by the standard H and standard K, that isalso secured to the plate A. The shaft J is form ed with a feather j,and has mounted thereon a friction-roller L, that is free to be movedalong the shaft J, and is operated by means of a worm M, mounted upon ashaft N, carried by standards H K. Motion is communicated to the shaft Jby suitable clockwork P, and from the shaft J to the shaft N by means ofcog-wheels mo, and the frictionroller L communicates motion to a conicaldrum Q, mounted upon a shaft 7, carried by the standards H K. Upon thisshaft is also mounted a pulley R, which by an elastic endless band 7'communicates motion to a pulley S, formed in one with a shaft 3. One endof this shaft is formed with a screw-thread s, that is passed throughone arm of the saddle 6 5 E and is screwed into the end of thecarboncarrier. The shaft 3 is supported in a bearing 6 on the end of anarm 6', projecting from the saddle E. The shaft is formed with a groovedwheel S, the outer end 8 working in a slot u formed in the rod U. Theshaft .9, pulley S, and grooved wheel S are made of some suitableinsulating material, such as hard rubber. The rod U forms one of theguides for the arm V, that carries the negative or pencil carbon \V, Ubeing the other rod or guide. To the grooved wheel S is secured one endof a belt or band 25, the other end of which is secured to the arm V, sothat as the shafts rotates the belt or band 15 is So wound upon thegrooved pulley, thus raising the arm V and carbon TV. On the end of thearm V opposite the belt 15 is secured a cord f, that passes over apulley g, and has at its other end a weight or counter-balance h, whichis provided with band or loop 71 that passes around the rod U, so thatit cannot swing about.

The positive wire X is connected to a spring or bush a, secured to butinsulated from the standard H, and its lower end is in connection withthe upper end E of the saddle-rod. The negative wire Y is connected tothe upper end of the rod U, which is by a spring or brush 'y connectedto the bar V. 9 5

The upper end of the rod U is insulated from the plate A and the bar Uis insulated from the bar V, through which it passes. The saddle-rod isalso insulated from the plate A, bevel-wheel G, and standard H, throughwhich Too it passes.

To operate the lamp, the clock-work P is wound up and the electriccurrent turned on, which passes down the saddlerod and saddle throughthe carbon holder C to the disk carbon B, thence to the pencil carbon IVthrough bar V, brush y, to rod U, and thence to the negative wire Y. Theclock-work being in motion causes the shafts J and N to rotate, and withthem the worm M and friction-Wheel L, which latter communicates motionto the cone Q and pulley R, which by belt r rotates the wheel 5, andwith it the disk carbon B, and at the same time the wheel S winds up theband It, thus raising the bar V and feeding the pencil carbon up. At thesame time the wheel I on shaft J communicates motion to the wheel Gr,thereby allowing the saddle and saddle-rod to fall, thus feeding thedisk-carbon down. As the disk carbon is consumed it has to be graduallydriven at a quicker speed, so that its surface-speed will always be thesame. This is accomplished by means of the friction-pulley L, cone-drumQ, and worm M, for as the shafts are rotated the friction-pulley L is bythe worm M caused to travel along the cone-drum Q, from its large to itssmall end, of course the speed of the same will be gradually increased.To reset the lamp, the shaft .9 is turned so as to detach it from thecarbon-holder O. The arms of the saddle E are then sprung sufficient toallow the holder to be taken out. The pin F is then withdrawn and thesaddle pushed up to its highest point, where it is retained by the pin Fas soon as the latter is released. The bar V is now drawn down to itslowest point, the pulley S being free to rotate independently of thepulleyR. New carbons are then inserted and the clock-work wound up, andthe lamp is again ready for use.

Although I have described the mechanism as being driven by clock-work,of course any other suitable or convenient motive-power may be employed.

1 claim- 1. In an arc lamp, the combination of the saddle for carryingthe carbon-holder, the saddle-rod having a screw-thread thereon, theupper end of said rod being square, the spiral disk carbon j ournaled insaid saddle, the pencil carbon, and mechanism for operating the same tokeep the carbons a suitable distance apart, substantially as set forth,

2. In an arc lamp, the combination of the saddle and saddle-rod having ascrew-thread thereon and an upper square end, the spiral disk carbonmounted in said saddle, and mechanism for rotating the spiral diskcarbon as it descends, whereby the surface speed of said carbon isgradually increased, substantially as set forth. 7

In an arc lamp, the spiral disk carbon mounted in a saddle on the end ofa rod having a screw-thread and square end, and a pin passing throughthe boss of a bevel-wheel for supporting said rod, so that it descendsthe bevel-wheel rotates, substantially as set forth.

l. In an arc lamp, the spiral disk carbon mounted in asaddle 011 the endof a rod having a screw-thread and square end, a pin in the boss of abevel-wheel through which said rod passes, and mechanism for rotatingsaid bevelwheel, in combination with a cone-drum, friction-pulley, and ascrew for moving said pulley on the drum, and a pulley and belt forimparting a gradually-increased rotary motion to the spiral disk carbon,substantially as set forth.

5. In an arc lamp,a disk carbon and mechanism for lowering said carbonand impart ing a gradually increased rotary motion thereto, incombination with a pencil carbon and mechanism for raising said carbontoward the disk carbon as they are consumed, substantially as set forth.

6. In an arc lamp, a spiral disk carbon ll, mounted in a saddle E, rodE, screw E square end E the plate A, standard II, bevel wheel G, pin F,the bevel-wheel I, shafts J N (1, friction-pulley L, worm M, cone-drumQ, pulley R, elastic belt 0', pulley S, groove-wheel S, band 6, plate V,pencil carbon IV, and suitable clock-work for imparting motion thereto,substantially as set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 28th day of October, A.D. 1890.

IlOSEA W. IJIBBEY.

IVitnesses:

CHAS. STEERE, EDWIN PLANTA.

